# SIMSON CASE vs Letter

The clearest difference is in-app purchases: SIMSON CASE at none against Letter's 6. SIMSON CASE also leads on iOS requirement (12.0 vs 16.4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Letter sells 6 one-off in-app purchases. SIMSON CASE asks for nothing beyond the download.

SIMSON CASE ships an update weekly, Letter every 5 days. The most recent releases landed on September 29, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | SIMSON CASE | Letter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.1 (7 ratings)](https://appshunter.io/ios/app/simson-case/id6751013114/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 5 days** |
| Monetization | Free | — |
| Size | 228 MB | 70 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen United Power Technology Co., Ltd.](https://appshunter.io/developer/1447215451) | [VUNYO](https://appshunter.io/developer/1768332147) |

## What reviewers say

### SIMSON CASE

[App page](https://appshunter.io/ios/app/simson-case/id6751013114)

Connect your phone case to customize dynamic watch faces. Design unique animated watch faces to express your style.

**Highlights:** Connect phone case, DIY dynamic watch faces, Customize animated designs, Personalize watch face style

**In-app purchases:** none


### Letter

[App page](https://appshunter.io/ios/app/letter-write-send-post-mail/id6786452084)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Credit | $1.99 | one-time |
| Credit | $4.99 | one-time |
| Credit | $6.99 | one-time |
| Credit | $9.99 | one-time |
| Credit | $19.99 | one-time |
| Credit | $49.99 | one-time |


## Frequently asked questions

### Is SIMSON CASE free?

SIMSON CASE is free to download, with no in-app purchases.

### Is Letter free?

Letter is free to download, with in-app purchases available.

### Do SIMSON CASE or Letter have ads?

Neither SIMSON CASE nor Letter shows ads.

### Which is updated more often, SIMSON CASE or Letter?

SIMSON CASE ships an update weekly, and Letter every 5 days. Most recently, SIMSON CASE was updated on September 29, 2026 and Letter on September 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*